Elecro Cygnet EVO2 Aquatic Heater 4kW (Digital)
| Brand | |
|---|---|
| Heating Output | 4kW |
| Control Type | digital thermostat control |
| Best Use | koi ponds, quarantine systems and pond systems where direct electric in-line heating is required |
| Installation Type | External in-line installation |
| Connection Size | 1½ inch / 50mm |
| Heating type | In-line electric heater |
Elecro 4 kW titanium in-line pond heater with digital control. 0.5°C thermostat differential and a required flow of 1,000–17,000 l/h; size around actual heat loss.
£799.99 (inc VAT)
Out of stock
Out of stock
Elecro Cygnet EVO2 4 kW Digital Pond Heater
Direct electric heating with digital temperature control
The 4 kW Cygnet EVO2 offers more element output than the 3 kW version. The electrical supply and protection need to be planned for this model by the installer, alongside the pond’s heat requirement.
The Cygnet version uses a grade 1 titanium heating element and titanium flow tube. This digital model controls the temperature with a digital display and selector control.
| Specification | Details |
|---|---|
| Nominal heater output | 4 kW |
| Electrical configuration | 220–240 V single phase; confirm the supplied unit and installation requirements |
| Control | Digital thermostat, 0–45°C control range |
| Thermostat differential | 0.5°C |
| Required flow through the heater | 1,000–17,000 litres/hour |
| Heating element and flow tube | Grade 1 titanium |
| Connections | 1½-inch BSP female; supplied 1½-inch / 50 mm stepped unions and 1¼-inch / 1½-inch hose tails |
| Maximum working pressure | 4 bar |
| Ingress protection | IP44; install within the dry, weatherproof environment required by the manual |
What the digital control changes
Elecro specifies a 0.5°C thermostat differential for the digital model, compared with 1.2°C for the analogue version. The display also makes the selected set point and controller status easier to read.
The differential describes the control switching band. It is not a promise that every point in the pond will stay within that distance of the set temperature, and it is not a stated ±temperature-measurement accuracy. Both control versions at 4 kW have the same nominal heating output.
The upper thermostat setting is a product capability, not a recommended pond temperature. Choose the target for the fish and the way the system is managed, allowing for gradual changes.
Flow, mounting and installation
Plan around the actual flow through the heater, after the pipework and filter have reduced the pump’s headline output. The manufacturer gives a minimum of 1,000 l/h and a maximum of 17,000 l/h. Its flow switch and over-temperature protection are safeguards; the installation must still keep the heater full of water and free of trapped air.
Use the mounting arrangement in the unit instructions, within a dry, permanent weatherproof area with access for service. The heater is positioned after the filter and before dosing equipment. Connecting pipework needs at least a 32 mm internal bore and the specified return-pipe safety loop to help it remain full and purge air.
A qualified electrician must install the supply and the manufacturer’s required protective circuit. The exact heater version and its supplied manual determine those requirements. Check the manufacturer’s permitted water-quality limits as part of the installation and maintenance plan.
Sizing and electricity use
Size the heater around water volume, exposed surface area, insulation, cover use, weather and the temperature to be maintained. A thermostat cannot compensate for a heater that is too small to replace the heat being lost.
At continuous full element output, this 4 kW version uses about 4 kWh in an hour. Multiply that by your electricity unit rate for an estimate of that hour’s heater cost. Actual running time depends on demand; pump consumption is additional.
Our pond heating guide explains those choices. You can also compare air-source pond heat pumps where the heating requirement and operating conditions suit that approach.
Related equipment and routine care
Compare the same-output analogue Cygnet EVO2 if you prefer the other control format. Browse the Elecro in-line pond heaters for other outputs, and plan suitable pipework and fittings around the selected unit.
Check the water circulation, connections and any deposits during maintenance. Follow the unit instructions for isolation, cleaning, frost protection and restarting; do not assume the titanium construction removes the need for those checks.
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